back button focus purpose

Started 4 months ago | Discussions thread
Allan Brown
Allan Brown Veteran Member • Posts: 3,064
Re: back button focus purpose

jerelee wrote:

What are the advantages of using back button focus?

Primarily, I use BBF to preselect a point of focus.

However, a lot depends on the camera body and the placement of the button.

I have BBF set up on my EP5 and I can easily reach the button with my thumb.

However, with my EM5II, the button is just a bit further away, so I don't have BBF set up.

With the EM5II, I use the 1/2 switch to select between AF and Manual focus. This also acts to lock the focus point if you are careful not to turn the focus ring on the lens.

Overall, BBF is something that I do not use often.

Allan

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